General Category >> Technical Documents/Reference >> Speedometer Cable "O" Ring leak

Message started by Digger on 03/10/10 at 21:52:43

Title: Speedometer Cable "O" Ring leak
Post by Digger on 03/10/10 at 21:52:43

Can't recall if this fix has been posted yet.

If you get an oil leak here,:

toss the POS OEM oil seal and get you a small o-ring.  Buna-N, Neoprene, or Viton is best.  Unscrew the cable end from the engine case.  Note that the diameter of the shaft section the o-ring goes on is about 0.275".  Put the o-ring here:

Smear a small bit of silicone grease on the o-ring and reinstall the speedo cable end to the engine case.  Don't overtighten.

End of problem......for a while.  The o-ring will not stand up to multiple R&Rs of the speedo cable.  But, if you leave the cable alone, it will last for quite some time.

IHTH someone!

Title: Re: Speedometer Cable "O" Ring leak fix
Post by Oldfeller on 08/22/12 at 18:10:10

LouSiana searched through lots of other 'zuki cable sets and discovered the correct stock OEM Suzuki ring lip seal hiding under part number 34943-11030 for $2.74 plus shipping.   This ring lip seal has eluded us for years but it is now finally found and identified.

Part number 34943-11030 ring lip seal for $2.74

Watch out for when you go to order from Ron Eyers or Bike Bandit as the standard Japanese short hand description for "Tachometer Cable Oil Seal" is TACH CABLE OIL which is certainly misleading to the reader and goes a long way to explain why nobody could ever find this part number before now.  Actually, it was found (and it was ignored) literally hundreds of times over all the years of parts list searching .....

The part actually looks like this:

Title: UPDATE!!!
Post by Digger on 09/01/14 at 13:37:20

After an aborted attempt at giving the OEM oil seal another try (it started leaking after only 400 miles of use - see here (, I decided to get more serious about the o-ring option.

Some local searching turned up a bearing and industrial supply house (Whisler Industrial Supply ( that carried a good selection of o-rings.

I bought a few of the following o-rings (they were only $0.35 each):

1/4" ID x 1/2" OD x 1/8" thick
70 durometer

I popped one of them into my bike, IAW the OP.  I will report if I run into any difficulties.  Otherwise, no news is good news.... [smiley=thumbup.gif]

For our overseas members, since the listed o-ring was a rather tight fit as far as ID went, you MAY want to try an o-ring measuring 7mm ID x 13mm OD x 3mm thick (if such a beast even exists)....just a guess....

UPDATE: Such beasts do exist!  See here (

Title: Re: Speedometer Cable "O" Ring leak
Post by Lagerhead1 on 04/22/15 at 23:10:30

Old thread, but Amazon has these o-rings in Viton rubber - should be a little more durable than nitrile.  Got a 10 pack for $5 and change, makes them roughly 50 cents apiece.   :D

Title: Re: Speedometer Cable "O" Ring leak
Post by old_rider on 04/23/15 at 17:17:18

I replaced my home made flat rubber washer with the OEM on my recent trip (my seal didn't leak) and the OEM one crapped on me!
To make matters worse, I didn't take my home made one with me... so I bought a flat 1/4 " rubber faucet washer from an ACE hardware store.
It seemed to work for about the first 100 miles (at 70-75mph constant speed on the super slab), then started to slowly leak.... the connector came loose, I retightened it but it has slowly leaked above 70mph (higher rpm's I would think), at about 55-60mph it didn't leak.
I bought a 3/8's brass end cap for a pipe, it fits thread wise, but needs a rubber washer inside the top. I didn't use it, but it was nice to know it fit and could have been used.
I'll put up the info in the next post, still sorting through all the vacation pictures.
On a side note.... versy mentioned a rubber seal inside the casing that might be leaking allowing all that oil to easily wick up the cable.

Title: Re: Speedometer Cable "O" Ring leak
Post by verslagen1 on 04/23/15 at 19:27:06

oem parts phish shows an o-ring
clymers shows that the drive can be taken out by removing a screw. pg 130+131
I'd take it out and see if you can easily replace the o-ring.

Title: Re: Speedometer Cable "O" Ring leak
Post by Dave on 04/24/15 at 03:22:50

I had a mysterious leak on my bike....and if you can't keep the oil from the speedometer drive you may have the same problem I was having.  

Sometimes I would get a spray of oil on the right side that would leave a bit of oil on the top right side of the engine case, and a fine spray of oil on the right side of the fuel tank.  It didn't happen all the was sporadic and it took a while to identify what was happening.  One day I had the bike all cleaned up to go to a show and on a group ride....the bike was spotless.  When I got on the highway I went full throttle through 4th gear, and suddenly the oil was on the tank.  I went back home and was able to find what was happening.

When I got at high rpm/full throttle the O-ring on the speedometer drive was leaking and allowing crankcase vapor/oil to come out of the seam between the case and aluminum shaft that the speedometer cable connects to.  The wind would then pick up the spray and carry it forward, up the front of my leg and onto the top of the tank....weird.  I only had about 15 minutes to fix it so I cut a piece of rubber tubing and slid it over the shaft and under the nut....a sort of sleeve that seals between the speedometer cable nut and the top of the engine case.

The proper cure would be to replace the O-ring - but the metal plate that fits behind the starter has to come off to remove the small screw that holds the speedometer drive in place....and I just didn't have time.  Also I believe there is a thrust washer on the speedometer drive shaft that is not shown in the diagram (I could be wrong - but I thought I remember a washer on the top or bottom of the spiral gear on the shaft), that needs to be kept track don't want it falling into the case.

The O-ring that was leaking was part #43 in the diagram linked below:

Title: Re: Speedometer Cable "O" Ring leak
Post by old_rider on 04/24/15 at 06:00:45

Ok, if I remove the screw at the starter plate and pull up on the threaded base... will anything iniside "drop"?
I'll have to look at a diagram myself I guess, so I can picture what is spinning in there.

The diagram you linked Dave show a "change shaft O" at #42 and a washer on the screw.
If I pull up on the shaft that the screw is holding (looks like it is just to keep it from spinning) will it misalign the lower shaft?
I'll ride it today and see if the oil is coming out of the screw area or from around the base of the mount or "sleeve" #43.
My leak was "weeping" or "wicking" up the speedo cable and coming out at the top of the speedo cable sleeve and running down the cable and the wind would spray it every where.
After changing to the faucet washer, it would only leak onto the case at the connection and spray back onto the battery box and run down the case. (my home made rubber washer did not leak)
I am going to pull my tank and check the breather hose at the top of the engine.. ... I am thinking like most that my compression pressure (piston down stroke) is not being released to atmosphere (air box) and it is forcing oil out the least path of resistance, which turns out to be a less than adequate cable seal area.

Title: Re: Speedometer Cable "O" Ring leak
Post by Dave on 04/24/15 at 11:28:13

If the oil is making it up the speedometer shaft, it is not the O-ring farther down causing the problem. » Powered by YaBB 2.2!
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